Blower.



T. J. BITTER.

BLOWER.

ABPLIOATION FILED SEPT. 10, 1913.

1 11 554 Patented Mar. 9, 1915.

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BLOWER.

APPLICATION FILED SEPT. 10, 1913.

@denid 2" MM 2% 7 a ney Patented M21119, 1915.

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THEODORE JONATHAN BITTER, OF NEVV' YORK, N. Y., ASSIGNOR OF ONE-HALF TOHENRY BERG, OF BROOKLYN, NEW YORK.

BLOWER.

Application filed. September 10, 1913.

To all whom it may concern Be it known that I, THEODORE JONATHAN BITTER,a citizen of the United States, residing at New York city, in the countyof Kings, State of New York, have invented certain new and usefulImprovements in Blowers, of which the following is a clear, full, andexact description.

This invention is an improvement in the multi-blade type of rotary fan,and consists in the combination with a series of narrow, closely setperipheral vanes, of a suitable number of inner vanes having the specialangular formation hereinafter described.

The invention also relates to the form of the peripheral vanes used inthis connection.

The features of construction and their advantages and mode of operationwill be described in detail in the following specification.

In the accompanying drawings: Figure 1 is a sectional side elevation ofa blower embodying my improvements. Fig. 2 is an enlarged detailperspective view of some of the peripheral vanes and adjacent centralvane. Fig. 3 is a vertical crosssectional view, the section being takenon a line 3-3 in Fig. 1. Fig. t is an enlarged sectional perspectiveview of one of the central vanes. Fig. 5 is a fragmentary verticalsectional view on a reduced scale, and looking from the right in Fig. 3,illustrating one manner of reinforcing the central vanes, the sectionbeing taken just inside the back plate.

The rotary member 2 or fan proper comprises a plurality of inner vanes &and a series of peripheral vanes 3. Before describing the vanes, it maybe explained that they are carried by a shaft (not shown), to which.

power is applied, the vanes being supported at one side by a disk 6fixed to the shaft by a hub 6 and at the other side united by a ring 7The latter forms the inlet side of the fan rotor, and is adjacent theside of the casing 1 having the intake opening 9, the inner circle ofthe ring and the said opening being preferably approximately of the samediameter. The disk 6 forms the back or closed side of the fan. Theseprinciples of construction are familiar in connection with centrifugalfans, and, as is well known, such an assemblage may be doubled, the diskthen being central instead of at one side. The inner vanes are bent orSpecification of Letters Patent.

Patented Mar. 9, 1915. Serial No. 789,035.

troughed, being composed, either actually or in effect, of two parts orplanes l0 and 11, disposed in angular relation to each other, formingpockets 11. The part 11, which may be distinguished as the inner partsince as a whole it is nearer the axis of the fan, is preferablyarranged in general tangential relation to the shaft or to a circledescribed about the axis, being thus inclined rearward from its inneredge with respect to the direction of movement (which is the same assaying that from its outer portion inwardly it inclines in the directionof movement.) The outer part 10 is bent forward with respect to thelower part and is disposed obliquely between the sides 6 and 7,extending rearwardly with respect to the direction of movement from theinlet side to the back side, as represented in Fig. 2. The vane as awhole partakes of this crosswise bias; the outer or peripheral edge ofthe part 10 rakes sharply rearward; and the inner edge of the part 11(the edge nearest the shaft) is also diagonaled in the same direction,though to a less extent. As is apparent from Fig. 1., the biasarrangement of the vanes is such that they overlap each other, theforward portion of each vane (at the inlet side) being in advance of therear portion of the vane next in front.

It is to be noted that the valley or angle between the parts 10 and 11,at the forward face of the vane extends in a diagonal direction from theinner portion of the vane, at or adjacent the inlet side, outward towardthe periphery and toward the back or disk side 6, and also rearwardlywith respect to the direction of movement.

In its preferred form the vane is composed of two substantiallytriangular planes. The parts 11 are widest near their inner portions andnarrow outwardly whereas the parts 10 are widest at the periphery andnarrow inwardly. Two sides of the triangle 10 form the outer edge andthe inlet edge 16 of the value, while two sides of the truncatedtriangle 11 form the inner edge and the back edge of the vane. The inletedges 16 of the vanes extend across the intake and all lie in asubstantially vertical plane perpendicular to the axis of the rotor.These edges may bear reinforcing strips 13 by which the vanes are boltedto the ring 7, while the back side edges have flanges 12 bolted orriveted to the disk 6. Between these side members 6'and 7 both parts ofthe inner vanes are included.

In operation the air is'cau'sed to enter as indicated by the arrows 15between theinlet edges 16 of the vanes, thetwo parts of which cooperatein anelfective manner to force the air from the central region of thefan outward to the peripheralvanes 3. By reason of the formation andgeneral rearward rake of the central vanes, transversely of the fan,escape of airrthrough the inlet and the production of back draft or eddycurrents are avoided or minimized, and the vane action as a whole isrendered more effective. a t. a

A further feature of the invention resides inthe formation anddisposition of the peripheral vanes 3 which consist of a curved outerportion 19 and a portion 20 tangentlal thereto and to. the shaft. Thetangential portion of the vanes 20 wedges the air out- Ward while thecurved or cup portion 19 carries the air around and drives it out in theusualmanner. 1

The angularity of the portion 20 of the vanes 3 is dependent upon thespeed of the blower, the higher the speed the greater will be the angleof the said portion.

The diagonal arrangement of the inner vanes 4; is such as to cause eachof these vanes to take in a plurality of the peripheral vanes, and theair is delivered from the pockets 11 to the ports between the portions20 of the peripheral vanes.

Ina divisional application filed March 27, 1914, Serial Number 827,561,I disclose a fan composed entirely of vanes on the order of the centralvanes of the present case, and in that application are included thebroad claims to vanes of this character. The claims of the present caseare directed to the combination of the central and peripheral vanes, andit therefore follows that the divisional application is the generic caseas to the angular vanes.

I claim as my invention:

1. A rotary fan member comprising a series of adjacent generallyparallel peripheral vanes, and a smaller number of central vanes eachdisposed diagonally so as to take in a plurality of the peripheral vanesand being of angular formation presenting a valley extending diagonallyfrom its inner portion at the intake side toits outer portion at theclosed side of the fan, the end of the valley which is toward the intakeside of the fan being located in advance of the opposite end asregardsthe direction of rotatlon.

, 2. A rotary .fan member comprising a series of adjacent generallyparallel peripheeral vanes, said peripheral vanes having substantiallyflat, tangentially disposed inner portions and curved outerjportions,and

a smaller number of central vanes each disposed diagonally so as toextend across the tangential inner portions of a plurality of theperipheral vanes and being of angular formation presenting a valley,extending diagonally from its inner portion atthe intake side to itsouter portion at the closedside of the fan, the end of the ,valley whichis toward the intake side of the fan being located in advanceof theopposite end as regards the direction of rotation. p

Signed at Ilion, N. Y., this 8th day of September, one thousand ninehundred and thirteen.

THEODORE JONATHAN BITTER.

WVitnesses: I

E. B. KONFI LD, FRANK A. SCHMIDT.

Copies of thls pateiit be obtained for five cents each, by addressingthe Goinniissibner of aliens. Washington, D. G.

